P0022

DTC P0011Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 1)
DTC P0012Camshaft Position "A" - Timing Over-Retarded (Bank 1)
DTC P0021Camshaft Position "A" - Timing Over-Advanced or System Performance (Bank 2)
DTC P0022Camshaft Position "A" - Timing Over-Retarded (Bank 2)

DESCRIPTION

DTC Detection Condition:

The Variable Valve Timing (VVT) system controls the intake camshaft to provide the optimal valve timing for every driving condition. This control is performed based on signals regarding as intake air volume, throttle position and engine coolant temperature.

The ECM controls the Oil Control Valve (OCV) based on the signals output from several sensors.The VVT controller regulates the intake camshaft angle using oil pressure through the OCV. As a result, the relative position between the camshaft and the crankshaft becomes optimal, and the engine torque improves, fuel economy improves, and exhaust emissions decrease under overall driving conditions. Also, the ECM detects the actual valve timing using the signals from the camshaft position sensor and the crankshaft position sensor, and performs feedback control. This is how target valve timing is achieved by the ECM.

MONITOR DESCRIPTION

Monitor Strategy:

Typical Enabling Conditions:

The ECM optimizes the valve timing using the VVT system to control the intake valve camshaft. The VVT system includes the ECM, the OCV and the VVT actuator. The ECM sends a target "duty-cycle" control signal to the OCV. This control signal, applied to the OCV, regulates the oil pressure supplied to the VVT controller. The VVT controller can advance or retard the intake valve camshaft.

Example: A DTC will set if: 1) the difference between the target and actual valve timing is more than 5° of the crankshaft angle and the condition continues for more than 4.5 seconds; or 2) the OCV is forcibly activated 63 times or more.

Advanced cam DTCs are subject to 1 trip detection logic.
Retarded cam DTCs are subject to 2 trip detection logic.

The monitor runs if all the conditions are met:
- The engine is warmed up (engine coolant temperature is 75 °C (167 °F) or more).
- The vehicle is driven over 40 km/h (25 mph) for 3 minutes.
- The engine is idled for 3 minutes.

TYPICAL MALFUNCTION THRESHOLDS

Typical Malfunctions Thresholds:

If the difference between target and actual camshaft timing is larger than the specified value, the ECM operates the VVT actuator.

Wiring Diagram:

Step 1:

Step 1(Continued)-3:

Step 4-5:

Step 6-7:

INSPECTION PROCEDURE

HINT:
- Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
- If DTC P0011 or P0012 is displayed, check the bank 1 VVT system circuit.
- If DTC P0021 or P0022 is displayed, check the bank 2 VVT system circuit.
- Bank 1 includes No. 1 cylinder, but bank 2 does not. No. 1 cylinder is located in the front part of the engine, opposite the transmission.

NOTE: DTCs P0011, P0012, P0021 or P0022 is output when a foreign object in the engine oil enters the system. These codes will stay set even if the system returns to normal after a short time. Foreign objects are filtered out by the oil filter.